Multi-Path Blow-By Gas Recirculation for Dual-Mode Ventilation
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Solution Overview
Problem
Existing blow-by gas recirculation devices for forced-induction engines are inefficient during both naturally aspirated and forced-induction operations, particularly in hydrogen engines, and fail to effectively ventilate blow-by gas.
Innovation Solution
A blow-by gas recirculation device with multiple passages and check valves that connect the crankcase to different sections of the intake passage, allowing for efficient ventilation during both operation modes, including a second passage that introduces cooled air during forced-induction to prevent pressure buildup and separate oil mist, and a check valve configuration to detect damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single passage connects the crankcase to the intake passage, then the device structure is simple, but the ventilation efficiency is insufficient during both naturally aspirated and forced-induction operations
Solution Approach 1:
The single passage is divided into multiple passages (first passage, second passage, third passage) that connect the crankcase to different sections of the intake passage. Each passage serves specific functional purposes: the first passage handles blow-by gas recirculation, the second passage introduces cooled air during forced-induction, and the third passage provides alternative ventilation paths. This segmentation enables simultaneous operation in both naturally aspirated and forced-induction modes while maintaining effective ventilation.
Solution Approach 2:
The multiple passages are designed to perform multiple functions across different operating conditions. The same passage system can operate effectively during both naturally aspirated operation and forced-induction operation, adapting to different pressure conditions and ventilation requirements. The check valves enable each passage to function appropriately based on the operational mode, making the entire system universal for various operating conditions.
2Adaptability or versatility
If check valves are added to control gas flow direction, then the adaptability to different operation modes is improved, but the device complexity increases
Solution Approach 1:
The check valves provide dynamic control of gas flow direction based on operating conditions. During naturally aspirated operation, the check valves direct flow through specific passages to maintain proper ventilation. During forced-induction operation, the check valves redirect flow through different passages to handle the increased pressure and temperature conditions. This dynamic adaptation allows the system to optimize performance for each operating mode without requiring complex active control mechanisms.
Solution Approach 2:
The check valves automatically respond to pressure differentials and flow conditions without requiring external control systems. The valves self-regulate the gas flow direction based on the operational mode, opening to allow flow when pressure conditions permit and closing when backpressure prevents flow. This self-service mechanism provides adaptability to different operation modes while avoiding the complexity of electronically controlled valves or additional control logic.
3Reliability
If multiple passages connect to different intake passage sections, then the ventilation coverage is improved, but the manufacturing complexity increases
Solution Approach 1:
The multiple passages are integrated into the existing engine structure by utilizing available spaces and mounting points. The passages are routed through existing components such as the intake manifold, crankcase, and intercooler, nesting the ventilation system within the existing engine architecture. This approach improves ventilation coverage by connecting multiple strategic points while avoiding the need for completely separate, complex piping systems that would be difficult to manufacture and install.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device efficiently ventilates blow-by gas during both naturally aspirated and forced-induction operations, prevents oil mixing, and detects damage to the ventilation system, ensuring reliable operation and efficient gas recirculation.
Implementation Method 1
a first check valve configured to permit a flow of gas from the interior of the crankcase to the intake passage through the first passage and restrict a flow of gas from the intake passage to the interior of the crankcase through the first passage
Implementation Method 2
an intercooler disposed in a portion of the intake passage downstream of the compressor
Data Source
AI summary
The blow-by gas recirculation device includes first to third passages and first and second check valves. The first to third passages respectively connect a portion of an intake passage downstream of a throttle valve, connect a portion of the intake passage downstream of an intercooler, and connect a portion of the intake passage upstream of a compressor to an interior of the crankcase. In the first passage, a first check valve is configured to permit a flow of gas from the interior of the crankcase to the intake passage and restrict a flow of gas from the intake passage to the interior of the crankcase. In the second passage, the second check valve is configured to permit a flow of gas from the intake passage to the interior of the crankcase and restrict a flow of gas from the interior of the crankcase to the intake passage.